1115 Sabauda

1115 Sabauda /səˈbɔːdə/ is a carbonaceous Meliboean asteroid from the outer region of the asteroid belt, approximately 68 kilometers in diameter. Discovered in 1928 by Italian astronomer Luigi Volta, it was assigned the provisional designation 1928 XC. The asteroid was probably named after the House of Savoy, the former rulers of Italy.^[2][13]

1115 Sabauda

Discovery[1]
Discovered by	L. Volta
Discovery site	Pino Torinese Obs.
Discovery date	13 December 1928
Designations
MPC designation	(1115) Sabauda
Pronunciation	/səˈbɔːdə/
Named after	House of Savoy (former rulers of Italy)[2]
Alternative designations	1928 XC · A906 YF
Minor planet category	main-belt · (outer)[3] Meliboea[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	88.47 yr (32,314 days)
Aphelion	3.6333 AU
Perihelion	2.5750 AU
Semi-major axis	3.1041 AU
Eccentricity	0.1705
Orbital period (sidereal)	5.47 yr (1,998 days)
Mean anomaly	58.449°
Mean motion	0° 10m 48.72s / day
Inclination	15.271°
Longitude of ascending node	71.679°
Argument of perihelion	57.292°
Physical characteristics
Dimensions	67.24±21.50 km[5] 68.53 km (derived)[3] 68.82±1.8 km[6] 70.76±0.90 km[7] 75.907±0.656 km[8] 75.91±0.66 km[8]
Synodic rotation period	6.7165±0.0007 h[a] 6.718±0.001 h[9] 6.72±0.01 h[10][11][b] 6.72±0.05 h[9] 6.732±0.005 h[9]
Geometric albedo	0.04±0.06[5] 0.044±0.006[8] 0.0496 (derived)[3] 0.068±0.002[7] 0.0711±0.004[6]
Spectral type	C[3]
Absolute magnitude (H)	9.30[6][7] · 9.60[8] · 9.63±0.62[12] · 9.69[5] · 9.7[1][3]

Discovery

Sabauda was discovered on 13 December 1928, by Italian astronomer Luigi Volta at the Observatory of Turin (Pino Torinese Observatory).^[13] Five nights later, it was independently discovered by Catalan astronomer Josep Comas i Solà at the Fabra Observatory in Barcelona, Spain. The asteroid was first identified as A906 YF at Heidelberg Observatory in December 1906,^[2] and its observation arc begins at Heidelberg in January 1929, one month after its official discovery observation at Pino Torinese.^[13]

Orbit and classification

Sabauda is a member of the Meliboea family, a smaller asteroid family of carbonaceous outer-belt asteroids with a few hundred members, named after 137 Meliboea.^{[4][14]: 23} It orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (1,998 days). Its orbit has an eccentricity of 0.17 and an inclination of 15° with respect to the ecliptic.^[1]

Physical characteristics

Sabauda is an assumed carbonaceous C-type asteroid,^[3] in line with the Meliboea family's overall spectral type.^[14]: 23

Rotation period

Several rotational lightcurves of Sabauda were obtained from photometric observations. Lightcurve analysis gave a rotation period between 6.718 and 6.732 hours with a brightness amplitude of 0.16 to 0.27 magnitude (U=2+/3-/3).^{[9][10][11][a][b]}

Diameter and albedo

According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Sabauda measures between 67.24 and 75.91 kilometers in diameter and its surface has an albedo between 0.04 and 0.0711.^[5][6][7][8]

The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0496 and a diameter of 68.53 kilometers based on an absolute magnitude of 9.7.^[3]

Naming

This minor planet bears the Latin name of the former rulers of Italy, the House of Savoy (Sabauda, or Sapauda). It is also possible that it was named after the new established town of Sabauda in the Pontine Marshes, central Italy.^[2] The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 104).^[2]

Notes

1. Polakis (2017) publication currently not yet indexed in ADS. Rotation period 6.7165±0.0007 hours. Summary figures for (1115) Sabauda at Collaborative Asteroid Lightcurve Link (CALL)
2. Lightcurve plot of 1115 Sabauda, Palmer Divide Observatory, Brian D. Warner (2006)